Point to be remembered while programing in C++

It is case sensitive, means it differentiates between uppercase letters and lowercase letters.
Program must be written in small letters only, so keep your caps lock always off.
All entered data is stored in variables. Variables are named memory locations. There are different types of variables, to be discussed in the subsequent topics.
All the variable must be declared before they are used. Declare all the variable in one place (can be declare anywhere in the program). Variable name must single word & start with a letter, can be followed by digits. For multiple words use under score(_) to join them. Give such a name to a variable so that it describes its use. Do not use any special characters like dot, comma, semicolon, star etc.
Program execution starts at the main function and it is from top to bottom.